Black Cat is about a former assassin, Train, and a former investigator, Sven. While Train was an assassin, he was known as Black Cat. He used to work for an organization known as Chronos. Chronos controls the world and maintains the peace. It has 13 of its own assassins. Train was the 13th. Train and Sven are now bounty hunters, known as Sweepers. Train bears the number 13, in roman numerals, on his left chest and on his gun. Sven wears an eye patch over his right eye. They make their living going from place to place and catching bounties. Another former member of Chronos, Creed, plots to destroy Chronos. Creed wants to make a new world. Creed creates an organization known as The Messengers of The Stars, and gather other people who have gained unique powers through a special potion. Train wants to kill Creed for something that happened in the past, Creed wants to recruit Train to his organization, and Chronos' assassins are putting Creed and The Messengers of the Stars as their number one objective to destroy.

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